Top panels: Adult cerebella from Nrcamtm1Gmt/Nrcamtm1Gmt (-/-) and its Nrcamtm1Gmt/Nrcam+ (+/-) littermate were observed under dissecting microscope and images were collected through CCD camera. Note that the length in anterior-posterior axis of lobes IV and V at the midline is shorter in the homozygous mutant mouse. Middle panels: Vibratome midsagittal sections of cerebella from adult mutant mouse and its heterozygous littermate were stained with cresyl violet. Note that lobes IV and V (arrows) of homozygotes are smaller than those of heterozygous littermates. In contrast, there was little or no change in size of lobe IX (arrowheads). Bottom panels: Vibratome midsagittal sections of cerebella from adult mutant mouse and its heterozygous littermate were visualized under phase contrast microscope.